post_grid_filter_grid_item_read_more

I want the read more button link to open in the same tab

I used following function to get read more button.

function post_grid_filter_grid_item_read_more_extra($read_more){

return $read_more.' Hello';

}
add_filter('post_grid_filter_grid_item_read_more','post_grid_filter_grid_item_read_more_extra');